This is a sad day. I've been watching this thread and hoping it would actually be fixed. This 'bug' is ending my streak. 6 yrs of events and this is the first I can't complete. Hanging quest for me is also Bring Back Memory.
I also can't submit a support ticket b/c it says no email is linked. Not sure why, as my UBISoft account, I sign in with my email, and go to my profile and it has my email.